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<title>class Rack::Cascade - rack-2.2.23 Documentation</title>

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  <h1 id="class-Rack::Cascade" class="class">
    class Rack::Cascade
  </h1>

<section class="description">
    
<p><a href="Cascade.html"><code>Rack::Cascade</code></a> tries a request on several apps, and returns the first response that is not 404 or 405 (or in a list of configured status codes).  If all applications tried return one of the configured status codes, return the last response.</p>

</section>

<section class="constants-list">
      <header>
        <h3>Constants</h3>
      </header>
      <dl>
      
        <dt id="NotFound">NotFound
        
        <dd><p>deprecated, no longer used</p>
        
      
      </dl>
    </section>

<section class="attribute-method-details" class="method-section">
      <header>
        <h3>Attributes</h3>
      </header>

<div class="method-description">
        
        <p>An array of applications to try in order.</p>
        
        </div>
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    </section>

<section id="public-class-5Buntitled-5D-method-details" class="method-section">
       <header>
         <h3>Public Class Methods</h3>
       </header>

<div id="method-c-new" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">new</span><span
            class="method-args">(apps, cascade_for = [404, 405])</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
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<div class="method-description">
          
          <p>Set the apps to send requests to, and what statuses result in cascading.  Arguments:</p>

<p>apps: An enumerable of rack applications. cascade_for: The statuses to use cascading for.  If a response is received</p>

<pre>from an app, the next app is tried.</pre>

<div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File lib/rack/cascade.rb, line 22</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">apps</span>, <span class="ruby-identifier">cascade_for</span> = [<span class="ruby-value">404</span>, <span class="ruby-value">405</span>])
  <span class="ruby-ivar">@apps</span> = []
  <span class="ruby-identifier">apps</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">app</span><span class="ruby-operator">|</span> <span class="ruby-identifier">add</span> <span class="ruby-identifier">app</span> }

<span class="ruby-ivar">@cascade_for</span> = {}
  [<span class="ruby-operator">*</span><span class="ruby-identifier">cascade_for</span>].<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">status</span><span class="ruby-operator">|</span> <span class="ruby-ivar">@cascade_for</span>[<span class="ruby-identifier">status</span>] = <span class="ruby-keyword">true</span> }
<span class="ruby-keyword">end</span></pre>
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     <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
       <header>
         <h3>Public Instance Methods</h3>
       </header>

</div>

<div class="aliases">
          Alias for: <a href="Cascade.html#method-i-add">add</a>
        </div>
        
      </div>

<div id="method-i-add" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">add</span><span
            class="method-args">(app)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
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<div class="method-description">
          
          <p>Append an app to the list of apps to cascade.  This app will be tried last.</p>

<div class="method-source-code" id="add-source">
            <pre><span class="ruby-comment"># File lib/rack/cascade.rb, line 57</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">add</span>(<span class="ruby-identifier">app</span>)
  <span class="ruby-ivar">@apps</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">app</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

<div class="aliases">
          Also aliased as: <a href="Cascade.html#method-i-3C-3C">&lt;&lt;</a>
        </div>

</div>

<div id="method-i-call" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">call</span><span
            class="method-args">(env)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
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<div class="method-description">
          
          <p>Call each app in order.  If the responses uses a status that requires cascading, try the next app.  If all responses require cascading, return the response from the last app.</p>

<div class="method-source-code" id="call-source">
            <pre><span class="ruby-comment"># File lib/rack/cascade.rb, line 33</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">call</span>(<span class="ruby-identifier">env</span>)
  <span class="ruby-keyword">return</span> [<span class="ruby-value">404</span>, { <span class="ruby-constant">CONTENT_TYPE</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-string">&quot;text/plain&quot;</span> }, []] <span class="ruby-keyword">if</span> <span class="ruby-ivar">@apps</span>.<span class="ruby-identifier">empty?</span>
  <span class="ruby-identifier">result</span> = <span class="ruby-keyword">nil</span>
  <span class="ruby-identifier">last_body</span> = <span class="ruby-keyword">nil</span>

<span class="ruby-ivar">@apps</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">app</span><span class="ruby-operator">|</span>
    <span class="ruby-comment"># The SPEC says that the body must be closed after it has been iterated</span>
    <span class="ruby-comment"># by the server, or if it is replaced by a middleware action. Cascade</span>
    <span class="ruby-comment"># replaces the body each time a cascade happens. It is assumed that nil</span>
    <span class="ruby-comment"># does not respond to close, otherwise the previous application body</span>
    <span class="ruby-comment"># will be closed. The final application body will not be closed, as it</span>
    <span class="ruby-comment"># will be passed to the server as a result.</span>
    <span class="ruby-identifier">last_body</span>.<span class="ruby-identifier">close</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">last_body</span>.<span class="ruby-identifier">respond_to?</span> <span class="ruby-value">:close</span>

<span class="ruby-identifier">result</span> = <span class="ruby-identifier">app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
    <span class="ruby-keyword">return</span> <span class="ruby-identifier">result</span> <span class="ruby-keyword">unless</span> <span class="ruby-ivar">@cascade_for</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-identifier">result</span>[<span class="ruby-value">0</span>].<span class="ruby-identifier">to_i</span>)
    <span class="ruby-identifier">last_body</span> = <span class="ruby-identifier">result</span>[<span class="ruby-value">2</span>]
  <span class="ruby-keyword">end</span>

<span class="ruby-identifier">result</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

</div>

<div id="method-i-include-3F" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">include?</span><span
            class="method-args">(app)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>

<div class="method-description">
          
          <p>Whether the given app is one of the apps to cascade to.</p>

<div class="method-source-code" id="include-3F-source">
            <pre><span class="ruby-comment"># File lib/rack/cascade.rb, line 62</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">include?</span>(<span class="ruby-identifier">app</span>)
  <span class="ruby-ivar">@apps</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-identifier">app</span>)
<span class="ruby-keyword">end</span></pre>
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